Propeller.



W. DEUTSCHER.

PROPELLBR.

APPLICATION FILED MAY 11. 1911.-

1,01 8,237.. Patented Feb. 20, 1912.

www@ w MLM 344m cfm/bom 135%@ ll'tozhe fix@ 13 UNITED STATES PATENT oFFIcE.

WILLIAM IDEJUIZSCHER,A 0F NEW YORK, N. Y.

PROPELLER.

To all whom 'it may concern: i

Be itl known that I, WILLIAM DEUTSCHER, a subject of the Emperor of Germany, re-

siding in the borough of Manhattan, city,

, one means of carrying out my invention, the

features thereof being more fully pointed.

out hereinafter in the claims.

In the drawings Figure 1 is a side elevation of one form of propeller constructed according to my invention, and Fig. 2 is a sectional view of a portionf of the helicalV vane along the line 2, 2 of Fig. l.

Similar letters of reference indicate similar parts throughout the several views.

vao

I cable to air propulsion.

I shall describe my invention as applied to marine propulsion, although it is obvious that the principles thereof areas Well appli- It is a well knownprinciple in marine engineering that the net propelling 'power ofascrew propeller is determined by the mass of water thrown rearward multiplied into the square of the velocity with which it is thrown and this is .one of the principles which I have applied in my new invention.

According to the present practice the propell er when it has reached a certain velocity has reached its highest efliciency and above this point, increase in velocity 1s useless, as

each propeller blade in its very rapid successive act-ion to the preceding one strikes almost the same spot as the preceding blade, hencev strikingin the vortex and almost in a vacuum and without obtaining thegreatest eiiciency. In other words, the propeller blades at a certain'limit of high speed strike in so-called dead water, the striking in Vwhich has little or no elfect in increasing the speed of the device driven. One reason for this is that the propeller blades do not strike in water' but in thel vortex or air space created by the preceding blade. By

Specification of Letters Patent. 7

Application filed May 11, 1911.

Patented Feb. 2o, 1912. serial No. (526,414.r I

my invention I obviate this disadvantage by providing means for pushing a constant supply of water against or toward the pro-` peller blades which always have live waterupon which to act'. The propeller blades vthus act on the water moving rearwardly or pushed against it from. the vane hereinafter described and the greater the velocity the greater the mass pushedrearwardly to the blades and hence the greater the speed. A propeller may therefore be driven at higher speed than heretofore with increase of eihciency instead of without advantage.

a indicates the propeller shaft which is driven by a suitable engine (not shown).

b, b indicate propeller blades of the usual typesecured to an elongatedhub c. The

hub c is secured to the propeller shaft a by any suitable means, such as by screws d.' c indicates a helical vane or blade on the hub c, the vane being shown 4as increasing f in diameter from front vto rear and terminating immediately adjacent the propeller blades Z) l). The turns of the helical vane or blade are shown as being substantially equidistant from each other. I prefer that the vane sh/all be so constructed although the diametrical//dimensions and shape of the vane may be varied/without departing from the spiritof my invention. As shown in` Fig. 2 Athe vane is inclined rearwardly. at its tip f and where it joins the hubo it is rounded so as to form a smooth roundnonresist-ant joint therewith.

. 'The rotation of my new propeller in the direction of the arrow, Fig. l, will push the Water astern to the propeller blades, the mass of Water so pushed being determined by the speed of rotation of the propeller shaft. By increasing the diameter of the elongated vane from front to rear, the front part of the vane presented less resistance to the water facilitating the subjection of the Water to the action of the vane, While at the same timel the rotation of the propeller as a whole has the-effect of forcing the vehicle to which it isattached, forward,

each portion of the elongated vane assisting.

in this forward propulsion by pushing. the water rearwardly, the blades b, b receiving the Water from the lvane and throwing it rearwardly. I have shown only two blades b, b although, of course, it is obvious that the number of blades is immaterial. I have also shown the vane as mounted upon a hub although it is obvious that it might aswell 'be mounted directly on the shaft. The construction shown may be as Well adapted to tvvin screws as to a single screw, as is o viens. i

I do not desire to restrict myself to the details shown further than the scope ofthe appended claims demand.

What I claim and desireto secure byLet# ters Patent-is:

1. The combination of a shaft, means for driving the saine, propeller blades mounted h on said shaft 'and a' continuous helical vane surrounding said 4shaft comprising a pluralityyof complete turns and terminating in one of said propeller blades.

2. The combination of a shaft, means for driving the same, an elongated hub mounted on said shaft, propellerblades ymounted on said hub yand kka continuous helical vane mounted on said hub comprising a plurality of complete turns and terminating in one of said propellerblades.

3. The combination of ash'aft, means for driving theV same,y propeller blades mounted on said shaft and a continuous helical vane surrounding said shaft comprising a plu-v rality of complete turns'and terminating 1n v Copies of this patentv may be obtained fo one of said propeller blades., the vane in 'creasing in diameter from front to rear.

4:. The combination of a shaft, means for surrounding said shaft comprising a `plurality of complete turns andterminating in one of said propeller bladesrthe turns of the helical vane bemgl substantially equidistant from each other. y i

`5. The combination of a shaft, means for driving the same, propeller blades mounted on said shaft and a continuous helical vane surrounding said shaft comprising a plurality of complete turns creasing in diameter from front to rear and the turns of the helix being substantially equidistant from each other.

Intestimony whereofv I have signed this specification -in the presence of ing Witnesses.

WILLIAM DEUTSCHER.

Witnesses: r Y

' ,SEABURY C. MAs'rioK,

K. G. LEARD.

ive cents each, by addressing the f Gomniissioner of Patents. Washington, D. C.

two subscrib?" 30 driving the same, propeller blades mountedl on said shaft and a continuous helical vane and terminating in one fsaid-propeller blades, said vane in- 

